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Wales weather in September 2025
Expect daytime maximum temperatures of 18°C in Wales in September based on long-term weather averages. There are 5 hours of sunshine per day on average with 15 days with some rainfall and typically 91 mm of rainfall in the month.
- 18°C max day temperature
18 - 5 hours of sunshine per day
- 15 days with some rainfall
15 - 10°C min night temperature
10 - 13 hours of daylight per day
13 - No heat & humidity
0 - 91 mm of monthly rainfall
91 - 4 (Moderate) UV index
4 - 17°C sea temperature
17
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The September weather guide for Wales (Cardiff) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Top Wales destinations
Below are average maximum temperatures at popular countries, regions and places in Wales in September. Select a holiday destination to see more weather parameters.
All Wales regions
All Wales destinations
- Aberaeron
- Abergavenny
- Aberystwyth
- Bangor
- Barmouth
- Betws-y-Coed
- Brecon
- Builth Wells
- Caernarfon
- Camarthen
- Cardiff
- Chepstow
- Colwyn Bay
- Cowbridge
- Fishguard
- Gower Peninsula
- Haverfordwest
- Hay-on-Wye
- Holyhead
- Lake Vyrnwy
- Llangollen
- Machynlleth
- Monmouth
- Pembroke
- Porthcawl
- Porthmadog
- Pwllheli
- Rhayader
- Rhyl
- St Davids
- Swansea
- Tenby
- Welshpool
- Wrexham
Metric (°C / mm) | Imperial (°F / inches)
More about Wales
How hot is it in Wales in September?
Daytime temperatures usually reach 18°C in Cardiff, Wales in September, falling to 10°C at night.
How sunny is it in Wales in September?
There are normally 5 hours of bright sunshine each day in Cardiff, Wales in September - that's 37% of daylight hours.
How warm is the sea around Wales in September?
The average sea temperature around Cardiff, Wales in September is 17°C.
Does it rain in Wales in September?
There are usually 15 days with some rain in Cardiff, Wales in September and the average monthly rainfall is 91mm.
Wales September sunrise & sunset times
Browse the sunrise and sunset times for Wales in September 2025. Select a month to view Wales sunrise and sunset times for the next 12 months. The Wales sunrise and sunset times shown below are for Cardiff.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Monday, 1st September 2025 | 05:26 | 18:59 |
| Monday, 15th September 2025 | 05:48 | 18:27 |
| Tuesday, 30th September 2025 | 06:12 | 17:52 |
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